Thurling, N. and Depittayanan, V. (1992) EMS induction of early flowering mutants in spring rape (Brassica napus). Plant Breeding, 108 (3). pp. 177-184.
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Abstract
Treatment of seeds of the highly inbred B. napus line TB8 with ethyl methanesulfonate (EMS) for 12 h had adverse effects on M1 plant development and fertility only when concentrations were greater than 1%. However, an EMS concentration of 1.5% did not reduce M1 plant fertility to an extent which significantly reduced production of M2 seeds. Genetic changes induced by EMS treatment and affecting flowering time were of 3 main types: (1) Changes within a polygenic system reflected by increased variation in flowering time among M2 families. As the increase in variation was due primarily to a higher frequency of later flowering plants, these polygenic changes would be of little value in developing better-adapted cultivars. (2) Induction of a recessive mutation at a major gene locus which caused M3 plants homozygous for the mutant gene to flower at least 20 days earlier than the parental line TB8. (3) Induction of a dominant mutation at a major gene locus which affects flowering time by causing a substantial reduction in vernalization requirement. M2 plants carrying the mutant gene flowered as early as 59 days before the parental line
| Item Type: | Article |
|---|---|
| Author Affiliation: | School of Agriculture, University of Western Australia, Nedlands, WA 6009, Australia |
| Subjects: | Crop Improvement |
| Divisions: | General |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 02 Apr 2013 05:01 |
| Last Modified: | 02 Apr 2013 05:01 |
| Official URL: | http://dx.doi.org/10.1111/j.1439-0523.1992.tb00118... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/9963 |
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